XT9 is a text predicting and correcting system for mobile devices with full keyboards rather than the 3x4 keypad on old phones.[1] It was originally developed by Tegic Communications, now part of Nuance Communications.[2] It was created for devices with styluses, but is now used for touch screen devices too. It is a successor to T9, a popular predictive text algorithm for mobile phones with only numeric pads.


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